An epic bug hunt featuring a unique blend of co-op play and squad-level tactics. With your friends, form a squad of four distinct IAF Marine classes. Plan your attack using an unlockable arsenal of weapons with countless loadout configurations against a wide variety of aliens. Blaze your way through an overrun, off-world colony, eradicating the alien infestation in environments ranging from the icy planet's surface, to a subterranean lava-flooded mining facility.

Summary List Popular Mods  (0 - 30 of 35)
Lambda Wars
Alien Swarm

1. Lambda Wars

4 days ago Released Sep 25, 2012 Single & Multiplayer Real Time Strategy

Lambda Wars (formerly Half-Life 2: Wars) brings the struggle between the human resistance and their Combine overlords to a multiplayer real-time strategy...

Alien Swarm: Reactive Drop
Alien Swarm

2. Alien Swarm: Reactive Drop

2 months ago Released Apr 9, 2014 Single, Multiplayer & Co-Op Arcade

Adds new PvP game modes, co-op features and singleplayer support into Alien Swarm without changing its concept.

Alien Swarm:SP
Alien Swarm

3. Alien Swarm:SP

1 year ago Released Feb 26, 2011 Single Player Third Person Shooter

Play the official Alien Swarm maps and any addons through the Offline Practice mode. Alien Swarm:SP also supports a large amount of configurable changes...

Black Mesa Swarm
Alien Swarm

4. Black Mesa Swarm

1 year ago Released Dec 20, 2013 Single & Multiplayer First Person Shooter

Black Mesa Swarm is an Alien Swarm total conversion remaking Valve Software's award-winning PC game, Half-Life.

Omnibus
Alien Swarm

5. Omnibus

4 years ago TBD Single & Multiplayer Arcade

Warhammer 40k mod for Alien Swarm. You play as one of four members in a Space Marine squad and you're sent to a Tyranid infected planet to investigate

Optic
Alien Swarm

6. Optic

1 week ago TBD Multiplayer First Person Shooter

Optic is a team-based multiplayer shooter where players can take the role of either a fast-moving runner or a slow-moving hunter.

Brawlers
Alien Swarm

7. Brawlers

2 years ago TBD Multiplayer Third Person Shooter

After the dust had settled from the worlds greatest war, stockpiles of defunct weapons and ammunitions around Europe were scheduled for destruction. Private...

Modular Combat 2
Alien Swarm

8. Modular Combat 2

1 week ago TBD Multiplayer & Co-op First Person Shooter

Modular Combat 2 is an upcoming role-playing shooter based in the Half-Life universe. The game will feature upgraded graphics with custom shaders, AI...

IAF Weapon Drop
Alien Swarm

9. IAF Weapon Drop

2 years ago Released Mar 28, 2012 Multiplayer Third Person Shooter

Almost all weapons were modified more or less noticeable. Some of them are big changes (like semi-auto Railguns and Sniper Rifles or Miniguns with lot...

Vectronic
Alien Swarm

10. Vectronic

3 days ago TBD Single Player Puzzle Compilation

Vectronic is a first-person environmental puzzle mod using Valve's Source Engine. Players must solve puzzles using special power balls that effect boxes...

Hypovolemia
Alien Swarm

11. Hypovolemia

1 month ago Released May 15, 2012 Single & Multiplayer Third Person Shooter

Hyp is a top-down shooter that focuses on intricate game design while offering a unique way to be immersed in the shooting culture.

ALIENS
Alien Swarm

12. ALIENS

1 year ago TBD Single & Multiplayer Tactical Shooter

A mod for Alien Swarm that is based on the ALIENS movie but for a set of new marines to go and investigate LV426 and see what happened there! (This is...

Alien Swarm Director Mod
Alien Swarm

13. Alien Swarm Director Mod

8 months ago Released Nov 3, 2011 Single Player Third Person Shooter

Welcome to the Alien Swarm Director Mod! ASDM is a single player Alien Swarm mod focusing on increasing replayability by creating a dynamic experience...

Swarm Keeper
Alien Swarm

14. Swarm Keeper

1 year ago Released Jun 3, 2012 Single & Multiplayer Real Time Strategy

Swarm Keeper is a Dungeon Keeper inspired modification for Alien Swarm. It offers the following features: Build a dungeon for your creatures (aliens...

Uprise
Alien Swarm

15. Uprise

2 years ago TBD Multiplayer First Person Shooter

The Resistance have mobilized agaisnt the Combine, causing the streets of City 17 to be turned into a warzone. Fight for the Resistance as a Rebel or...

SourceForts 2
Alien Swarm

16. SourceForts 2

2 years ago TBD Multiplayer First Person Shooter

Redefine the environment around you. SourceForts 2 is a FPS game designed around building your base and battling against the opposing team in order to...

B.R.I.S.k.
Alien Swarm

17. B.R.I.S.k.

1 year ago TBD Single Player Arcade

B.R.I.S.k. is a game with unique gameplay developed by a team «Two On The One Box», which has created a modification for the game Portal 2 - Afterword...

Lights
Alien Swarm

18. Lights

2 years ago TBD Single & Multiplayer Cinematic

Once you find the light, nothing can defeat you...

ALIEN SWARM FP
Alien Swarm

19. ALIEN SWARM FP

1 year ago TBD Co-op First Person Shooter

This is a first person view modification of "Alien Swarm"

Swarm Director 2
Alien Swarm

20. Swarm Director 2

5 months ago Released Jul 4, 2014 Single & Co-op Third Person Shooter

Alien Swarm with a twist. Better AI, new mutations, new mapper tools.

Lylat's Last Stand
Alien Swarm

21. Lylat's Last Stand

1 year ago TBD Single & Multiplayer Third Person Shooter

SFR (WIP title) is a mod for the Source Engine. It's based on the 3d shooter game Starfox. It will be mostly based on the 1993 nintendo power comics...

Alien Swarm:Silencer Mod
Alien Swarm

22. Alien Swarm:Silencer Mod

1 month ago Released Nov 11, 2014 Single, Multiplayer & Co-Op Third Person Shooter

Do you think the aliens are deaf?Unfortunately,they have perfect hearing ability.In another word,the huge noice comes from your weapons can attract the...

Alien Swarm Aliens Mod
Alien Swarm

23. Alien Swarm Aliens Mod

4 years ago Released Oct 31, 2010 Single & Multiplayer Tactical Shooter

this "mod" will replace weapon's data and sounds for alien swarm making it feel like Aliens. Furthermore, maps will be made for this mod and the final...

ASB²  mod
Alien Swarm

24. ASB² mod

2 years ago Released Jul 2, 2012 Multiplayer Tactical Shooter

ASB² mode (alien swarm beyond brutal) is a reborn ASBi game mode emphasizing the higher degree of difficulty, which includes the invalidity of such options...

Alien Haunt
Alien Swarm

25. Alien Haunt

4 years ago Released Oct 31, 2010 Single & Multiplayer Adventure

Alien Haunt. A Map for Alien Swarm. 1 Campaign with 5 maps. Get ready to be swarmed by aliens!

Alien Swarm SDK Template Conversion
Alien Swarm

26. Alien Swarm SDK Template Conversion

2 years ago Released Mar 14, 2012 Single & Multiplayer First Person Shooter

C_b_fofep and I decided to convert the Alien Swarm build back into an FPS source engine version. This takes the orange box or the SDK template code and...

Infested Office
Alien Swarm

27. Infested Office

4 years ago Released Jul 21, 2010 Single & Multiplayer Third Person Shooter

A test of skill and teamwork, this addon/map pack challenges you and your team even on the easier difficulty settings.

Alien Swarm: The Darkness
Alien Swarm

28. Alien Swarm: The Darkness

4 years ago TBD Single & Multiplayer Tactical Shooter

The Darkness is a mod designed to put the players into a much more difficult position than that of the original Alien Swarm, by removing a lot of lighting...

Infestation
Alien Swarm

29. Infestation

4 years ago TBD Multiplayer Third Person Shooter

Lots more details in latest news post, looking for more team members too - if you feel you have something you could add to the mod send me a pm for a...

Alien Frenzy
Alien Swarm

30. Alien Frenzy

4 years ago TBD Multiplayer Real Time Strategy

The year is 2026. The earth has been mostly destroyed by sunflares after the alien invasion. It seems their planet was destroyed first. The aliens came...

Icon
Alien Swarm
Platform
Windows
Developer & Publisher
Valve
Engine
Source
Contact
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Official Page
Alienswarm.com
Release Date
Released Jul 18, 2010
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Popular Mods
Lambda Wars (Alien Swarm)
Lambda Wars Alien Swarm - Single & Multiplayer Real Time Strategy
Alien Swarm: Reactive Drop (Alien Swarm)
Alien Swarm: Reactive Drop Alien Swarm - Single, Multiplayer & Co-Op Arcade
Alien Swarm:SP (Alien Swarm)
Alien Swarm:SP Alien Swarm - Single Player Third Person Shooter
Black Mesa Swarm (Alien Swarm)
Black Mesa Swarm Alien Swarm - Single & Multiplayer First Person Shooter
Omnibus (Alien Swarm)
Omnibus Alien Swarm - Single & Multiplayer Arcade
Optic (Alien Swarm)
Optic Alien Swarm - Multiplayer First Person Shooter
Brawlers (Alien Swarm)
Brawlers Alien Swarm - Multiplayer Third Person Shooter
Modular Combat 2 (Alien Swarm)
Modular Combat 2 Alien Swarm - Multiplayer & Co-op First Person Shooter
IAF Weapon Drop (Alien Swarm)
IAF Weapon Drop Alien Swarm - Multiplayer Third Person Shooter
Vectronic (Alien Swarm)
Vectronic Alien Swarm - Single Player Puzzle Compilation
Hypovolemia (Alien Swarm)
Hypovolemia Alien Swarm - Single & Multiplayer Third Person Shooter
ALIENS (Alien Swarm)
ALIENS Alien Swarm - Single & Multiplayer Tactical Shooter
Alien Swarm Director Mod (Alien Swarm)
Alien Swarm Director Mod Alien Swarm - Single Player Third Person Shooter
Swarm Keeper (Alien Swarm)
Swarm Keeper Alien Swarm - Single & Multiplayer Real Time Strategy
Uprise (Alien Swarm)
Uprise Alien Swarm - Multiplayer First Person Shooter